How to use AcquireReadableStreamDefaultReader method in wpt

Best JavaScript code snippet using wpt

readable_stream.ts

Source:readable_stream.ts

1// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.2import {3  acquireReadableStreamDefaultReader,4  initializeReadableStream,5  isReadableStream,6  isReadableStreamLocked,7  isUnderlyingByteSource,8  isWritableStream,9  isWritableStreamLocked,10  makeSizeAlgorithmFromSizeFunction,11  setFunctionName,12  setPromiseIsHandledToTrue,13  readableStreamCancel,14  ReadableStreamGenericReader,15  readableStreamPipeTo,16  readableStreamTee,17  setUpReadableByteStreamControllerFromUnderlyingSource,18  setUpReadableStreamDefaultControllerFromUnderlyingSource,19  validateAndNormalizeHighWaterMark,20} from "./internals.ts";21import { ReadableByteStreamControllerImpl } from "./readable_byte_stream_controller.ts";22import { ReadableStreamAsyncIteratorPrototype } from "./readable_stream_async_iterator.ts";23import { ReadableStreamDefaultControllerImpl } from "./readable_stream_default_controller.ts";24import * as sym from "./symbols.ts";25import { customInspect } from "../console.ts";26import { AbortSignalImpl } from "../abort_signal.ts";27// eslint-disable-next-line @typescript-eslint/no-explicit-any28export class ReadableStreamImpl<R = any> implements ReadableStream<R> {29  [sym.disturbed]: boolean;30  [sym.readableStreamController]:31    | ReadableStreamDefaultControllerImpl<R>32    | ReadableByteStreamControllerImpl;33  [sym.reader]: ReadableStreamGenericReader<R> | undefined;34  [sym.state]: "readable" | "closed" | "errored";35  // eslint-disable-next-line @typescript-eslint/no-explicit-any36  [sym.storedError]: any;37  constructor(38    underlyingSource: UnderlyingByteSource | UnderlyingSource<R> = {},39    strategy:40      | {41          highWaterMark?: number;42          size?: undefined;43        }44      | QueuingStrategy<R> = {}45  ) {46    initializeReadableStream(this);47    const { size } = strategy;48    let { highWaterMark } = strategy;49    const { type } = underlyingSource;50    if (isUnderlyingByteSource(underlyingSource)) {51      if (size !== undefined) {52        throw new RangeError(53          `When underlying source is "bytes", strategy.size must be undefined.`54        );55      }56      highWaterMark = validateAndNormalizeHighWaterMark(highWaterMark ?? 0);57      setUpReadableByteStreamControllerFromUnderlyingSource(58        this,59        underlyingSource,60        highWaterMark61      );62    } else if (type === undefined) {63      const sizeAlgorithm = makeSizeAlgorithmFromSizeFunction(size);64      highWaterMark = validateAndNormalizeHighWaterMark(highWaterMark ?? 1);65      setUpReadableStreamDefaultControllerFromUnderlyingSource(66        this,67        underlyingSource,68        highWaterMark,69        sizeAlgorithm70      );71    } else {72      throw new RangeError(73        `Valid values for underlyingSource are "bytes" or undefined.  Received: "${type}".`74      );75    }76  }77  get locked(): boolean {78    if (!isReadableStream(this)) {79      throw new TypeError("Invalid ReadableStream.");80    }81    return isReadableStreamLocked(this);82  }83  // eslint-disable-next-line @typescript-eslint/no-explicit-any84  cancel(reason?: any): Promise<void> {85    if (!isReadableStream(this)) {86      return Promise.reject(new TypeError("Invalid ReadableStream."));87    }88    if (isReadableStreamLocked(this)) {89      return Promise.reject(90        new TypeError("Cannot cancel a locked ReadableStream.")91      );92    }93    return readableStreamCancel(this, reason);94  }95  getIterator({96    preventCancel,97  }: { preventCancel?: boolean } = {}): AsyncIterableIterator<R> {98    if (!isReadableStream(this)) {99      throw new TypeError("Invalid ReadableStream.");100    }101    const reader = acquireReadableStreamDefaultReader(this);102    const iterator = Object.create(ReadableStreamAsyncIteratorPrototype);103    iterator[sym.asyncIteratorReader] = reader;104    iterator[sym.preventCancel] = Boolean(preventCancel);105    return iterator;106  }107  getReader({ mode }: { mode?: string } = {}): ReadableStreamDefaultReader<R> {108    if (!isReadableStream(this)) {109      throw new TypeError("Invalid ReadableStream.");110    }111    if (mode === undefined) {112      return acquireReadableStreamDefaultReader(this, true);113    }114    mode = String(mode);115    // 3.2.5.4.4 If mode is "byob", return ? AcquireReadableStreamBYOBReader(this, true).116    throw new RangeError(`Unsupported mode "${mode}"`);117  }118  pipeThrough<T>(119    {120      writable,121      readable,122    }: {123      writable: WritableStream<R>;124      readable: ReadableStream<T>;125    },126    { preventClose, preventAbort, preventCancel, signal }: PipeOptions = {}127  ): ReadableStream<T> {128    if (!isReadableStream(this)) {129      throw new TypeError("Invalid ReadableStream.");130    }131    if (!isWritableStream(writable)) {132      throw new TypeError("writable is not a valid WritableStream.");133    }134    if (!isReadableStream(readable)) {135      throw new TypeError("readable is not a valid ReadableStream.");136    }137    preventClose = Boolean(preventClose);138    preventAbort = Boolean(preventAbort);139    preventCancel = Boolean(preventCancel);140    if (signal && !(signal instanceof AbortSignalImpl)) {141      throw new TypeError("Invalid signal.");142    }143    if (isReadableStreamLocked(this)) {144      throw new TypeError("ReadableStream is locked.");145    }146    if (isWritableStreamLocked(writable)) {147      throw new TypeError("writable is locked.");148    }149    const promise = readableStreamPipeTo(150      this,151      writable,152      preventClose,153      preventAbort,154      preventCancel,155      signal156    );157    setPromiseIsHandledToTrue(promise);158    return readable;159  }160  pipeTo(161    dest: WritableStream<R>,162    { preventClose, preventAbort, preventCancel, signal }: PipeOptions = {}163  ): Promise<void> {164    if (!isReadableStream(this)) {165      return Promise.reject(new TypeError("Invalid ReadableStream."));166    }167    if (!isWritableStream(dest)) {168      return Promise.reject(169        new TypeError("dest is not a valid WritableStream.")170      );171    }172    preventClose = Boolean(preventClose);173    preventAbort = Boolean(preventAbort);174    preventCancel = Boolean(preventCancel);175    if (signal && !(signal instanceof AbortSignalImpl)) {176      return Promise.reject(new TypeError("Invalid signal."));177    }178    if (isReadableStreamLocked(this)) {179      return Promise.reject(new TypeError("ReadableStream is locked."));180    }181    if (isWritableStreamLocked(dest)) {182      return Promise.reject(new TypeError("dest is locked."));183    }184    return readableStreamPipeTo(185      this,186      dest,187      preventClose,188      preventAbort,189      preventCancel,190      signal191    );192  }193  tee(): [ReadableStreamImpl<R>, ReadableStreamImpl<R>] {194    if (!isReadableStream(this)) {195      throw new TypeError("Invalid ReadableStream.");196    }197    return readableStreamTee(this, false);198  }199  [customInspect](): string {200    return `${this.constructor.name} { locked: ${String(this.locked)} }`;201  }202  [Symbol.asyncIterator](203    options: {204      preventCancel?: boolean;205    } = {}206  ): AsyncIterableIterator<R> {207    return this.getIterator(options);208  }209}...

tee.ts

Source:tee.ts

1import { CreateReadableStream, IsReadableStream, ReadableStream, ReadableStreamCancel } from '../readable-stream';2import { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead, ReadRequest } from './default-reader';3import assert from '../../stub/assert';4import { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';5import {6  ReadableStreamDefaultController,7  ReadableStreamDefaultControllerClose,8  ReadableStreamDefaultControllerEnqueue,9  ReadableStreamDefaultControllerError10} from './default-controller';11import { CreateArrayFromList } from '../abstract-ops/ecmascript';12export function ReadableStreamTee<R>(stream: ReadableStream<R>,13                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {14  assert(IsReadableStream(stream));15  assert(typeof cloneForBranch2 === 'boolean');16  const reader = AcquireReadableStreamDefaultReader<R>(stream);17  let reading = false;18  let canceled1 = false;19  let canceled2 = false;20  let reason1: any;21  let reason2: any;22  let branch1: ReadableStream<R>;23  let branch2: ReadableStream<R>;24  let resolveCancelPromise: (reason: any) => void;25  const cancelPromise = newPromise<any>(resolve => {26    resolveCancelPromise = resolve;27  });28  function pullAlgorithm(): Promise<void> {29    if (reading) {30      return promiseResolvedWith(undefined);31    }32    reading = true;33    const readRequest: ReadRequest<R> = {34      _chunkSteps: value => {35        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using36        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let37        // successful synchronously-available reads get ahead of asynchronously-available errors.38        queueMicrotask(() => {39          reading = false;40          const value1 = value;41          const value2 = value;42          // There is no way to access the cloning code right now in the reference implementation.43          // If we add one then we'll need an implementation for serializable objects.44          // if (!canceled2 && cloneForBranch2) {45          //   value2 = StructuredDeserialize(StructuredSerialize(value2));46          // }47          if (!canceled1) {48            ReadableStreamDefaultControllerEnqueue(49              branch1._readableStreamController as ReadableStreamDefaultController<R>,50              value151            );52          }53          if (!canceled2) {54            ReadableStreamDefaultControllerEnqueue(55              branch2._readableStreamController as ReadableStreamDefaultController<R>,56              value257            );58          }59        });60      },61      _closeSteps: () => {62        reading = false;63        if (!canceled1) {64          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);65        }66        if (!canceled2) {67          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);68        }69      },70      _errorSteps: () => {71        reading = false;72      }73    };74    ReadableStreamDefaultReaderRead(reader, readRequest);75    return promiseResolvedWith(undefined);76  }77  function cancel1Algorithm(reason: any): Promise<void> {78    canceled1 = true;79    reason1 = reason;80    if (canceled2) {81      const compositeReason = CreateArrayFromList([reason1, reason2]);82      const cancelResult = ReadableStreamCancel(stream, compositeReason);83      resolveCancelPromise(cancelResult);84    }85    return cancelPromise;86  }87  function cancel2Algorithm(reason: any): Promise<void> {88    canceled2 = true;89    reason2 = reason;90    if (canceled1) {91      const compositeReason = CreateArrayFromList([reason1, reason2]);92      const cancelResult = ReadableStreamCancel(stream, compositeReason);93      resolveCancelPromise(cancelResult);94    }95    return cancelPromise;96  }97  function startAlgorithm() {98    // do nothing99  }100  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);101  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);102  uponRejection(reader._closedPromise, (r: any) => {103    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);104    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);105  });106  return [branch1, branch2];...

Using AI Code Generation

1var rs = new ReadableStream({2  start(controller) {3    controller.enqueue("a");4    controller.enqueue("b");5    controller.enqueue("c");6  }7});8var reader = rs.getReader();9var read1 = reader.read();10var read2 = reader.read();11var read3 = reader.read();12var read4 = reader.read();13var readAll = Promise.all([read1, read2, read3, read4]).then(function (values) {14  console.log(values);15});16test.js:12 Uncaught (in promise) TypeError: Cannot read property 'read' of undefined17I’m not sure if this is a bug or not, but it seems like it. I’m using the latest version of wpt (0.2.2) and I’m getting the following error:18    at ReadableStreamDefaultControllerCallPullIfNeeded (readable-stream.js:1028)19    at ReadableStreamDefaultControllerClose (readable-stream.js:1038)20    at ReadableStreamDefaultController.error (readable-stream.js:1047)

Using AI Code Generation

1const rs = new ReadableStream({2  start(controller) {3    controller.enqueue('a');4    controller.enqueue('b');5    controller.enqueue('c');6  }7});8const reader = rs.getReader();9const read1 = reader.read();10const read2 = reader.read();11const read3 = reader.read();12read1.then(result1 => {13  console.log(result1);14  read2.then(result2 => {15    console.log(result2);16    read3.then(result3 => {17      console.log(result3);18    });19  });20});21const rs = new ReadableStream({22  start(controller) {23    controller.enqueue(new Uint8Array([0, 1, 2]).buffer);24    controller.enqueue(new Uint8Array([3, 4, 5]).buffer);25    controller.enqueue(new Uint8Array([6, 7]).buffer);26  }27});28const reader = rs.getReader({ mode: 'byob' });29const view1 = new Uint8Array(3);30const readInto1 = reader.read(view1);31const view2 = new Uint8Array(3);32const readInto2 = reader.read(view2);33const view3 = new Uint8Array(3);34const readInto3 = reader.read(view3);35readInto1.then(result1 => {36  console.log(result1);37  readInto2.then(result2 => {38    console.log(result2);39    readInto3.then(result3 => {40      console.log(result3);41    });42  });43});44new ReadableStream([underlyingSource[, strategy]])

Using AI Code Generation

1const { ReadableStream } = require('stream/web');2const reader = new ReadableStream().getReader();3assert(reader instanceof ReadableStreamDefaultReader);4const { ReadableStream } = require('stream/web');5const reader = new ReadableStream({6}).getReader({ mode: 'byob' });7assert(reader instanceof ReadableStreamBYOBReader);8const { ReadableStream, ReadableStreamDefaultReader } = require('stream/web');9const rs = new ReadableStream({10  start(c) {11    c.enqueue('a');12    c.enqueue('b');13    c.enqueue('c');14  }15});16const reader = new ReadableStreamDefaultReader(rs);17const read = await reader.read();18const { ReadableStream, ReadableStreamBYOBReader } = require('stream/web');19const rs = new ReadableStream({20  pull(c) {21    c.enqueue(new Uint8Array([97, 98, 99]).buffer);22  }23});24const reader = new ReadableStreamBYOBReader(rs);25const ab = new ArrayBuffer(2);26const view = new Uint8Array(ab);27const read = await reader.read(view);28const { ReadableStream, ReadableStreamDefaultController } = require('stream/web');29const rs = new ReadableStream({30  start(c) {31  }32});33const reader = rs.getReader();34const { ReadableStream, ReadableStreamDefaultController } = require('stream/web');35const rs = new ReadableStream({36  start(c) {37  }38});39const reader = rs.getReader();40const { ReadableStream, ReadableStreamDefaultController } = require('stream/web

Using AI Code Generation

1test(() => {2  const stream = new ReadableStream();3  const reader = stream.getReader();4  assert_true(reader instanceof ReadableStreamDefaultReader);5}, 'ReadableStream.getReader() returns a ReadableStreamDefaultReader');6test(() => {7  const stream = new ReadableStream();8  const reader = stream.getReader({mode: 'byob'});9  assert_true(reader instanceof ReadableStreamBYOBReader);10}, 'ReadableStream.getReader({mode: "byob"}) returns a ReadableStreamBYOBReader');11test(() => {12  const stream = new ReadableStream();13  const reader = stream.getReader({mode: 'byob'});14  assert_true(reader instanceof ReadableStreamBYOBReader);15}, 'ReadableStream.getReader({mode: "byob"}) returns a ReadableStreamBYOBReader');16test(() => {17  const stream = new ReadableStream();18  const reader = stream.getReader({mode: 'byob'});19  assert_true(reader instanceof ReadableStreamBYOBReader);20}, 'ReadableStream.getReader({mode: "byob"}) returns a ReadableStreamBYOBReader');21test(() => {22  const stream = new ReadableStream();23  const reader = stream.getReader({mode: 'byob'});24  assert_true(reader instanceof ReadableStreamBYOBReader);25}, 'ReadableStream.getReader({mode: "byob"}) returns a ReadableStreamBYOBReader');26test(() => {27  const stream = new ReadableStream();28  const reader = stream.getReader({mode: 'byob'});29  assert_true(reader instanceof ReadableStreamBYOBReader);30}, 'ReadableStream.getReader({mode: "byob"}) returns a ReadableStreamBYOBReader');31test(() => {32  const stream = new ReadableStream();

Using AI Code Generation

1const stream = new ReadableStream({2  start(controller) {3    controller.enqueue('a');4    controller.enqueue('b');5    controller.enqueue('c');6  }7});8const reader = stream.getReader();9reader.read().then(result1 => {10  return reader.read();11}).then(result2 => {12  return reader.read();13}).then(result3 => {14  return reader.read();15}).then(result4 => {16});17const stream = new WritableStream({18  write(chunk, controller) {19    console.log(chunk);20  }21});22const writer = stream.getWriter();23writer.write('a');24writer.write('b');25writer.write('c');26writer.close();27const stream = new ReadableStream({28  pull(controller) {29    networkPullInto(controller.byobRequest.view).then(bytesRead => {30      controller.byobRequest.respond(bytesRead);31    });32  }33});34const reader = stream.getReader({mode: 'byob'});35const view = new Uint8Array(4);36reader.read(view).then(result => {37  const bytes = result.value;38  const done = result.done;39  console.log(bytes);40  console.log(done);41});42const stream = new ReadableStream({43  pull(controller) {44    networkPullInto(controller.byobRequest.view).then(bytesRead => {45      controller.byobRequest.respond(bytesRead);46    });47  }48});49const reader = stream.getReader({mode: '

Using AI Code Generation

1var test = async_test("AcquireReadableStreamDefaultReader method of wpt");2var readableStream = new ReadableStream({3  start: function(controller) {4    controller.enqueue("a");5    controller.enqueue("b");6    controller.enqueue("c");7  }8});9var reader = readableStream.getReader();10test.step(function() {11  assert_equals(reader.read().value, "a", "read() should return the first chunk");12  assert_equals(reader.read().value, "b", "read() should return the second chunk");13  assert_equals(reader.read().value, "c", "read() should return the last chunk");14  assert_equals(reader.read().done, true, "read() should return done");15  test.done();16});17var test = async_test("AcquireReadableStreamDefaultReader method of wpt");18var readableStream = new ReadableStream({19  start: function(controller) {20    controller.enqueue("a");21    controller.enqueue("b");22    controller.enqueue("c");23  }24});25var reader = readableStream.getReader();26test.step(function() {27  assert_equals(reader.read().value, "a", "read() should return the first chunk");28  assert_equals(reader.read().value, "b", "read() should return the second chunk");29  assert_equals(reader.read().value, "c", "read() should return the last chunk");30  assert_equals(reader.read().done, true, "read() should return done");31  test.done();32});33var test = async_test("Acquire

Using AI Code Generation

1var rs = new ReadableStream({2  start(controller) {3    controller.enqueue("a");4    controller.enqueue("b");5    controller.enqueue("c");6  }7});8var reader = rs.getReader();9var rs = new ReadableStream({10  start(controller) {11    controller.enqueue(new Uint8Array([0x01]));12    controller.enqueue(new Uint8Array([0x02]));13    controller.enqueue(new Uint8Array([0x03]));14  }15});16var reader = rs.getReader({

Using AI Code Generation

1var rs = new ReadableStream();2var reader = rs.getReader();3assert_equals(reader.read(), undefined);4assert_equals(reader.closed, undefined);5assert_equals(reader.read(), undefined);6var rs = new ReadableStream();7var reader = rs.getReader();8var promise = reader.read();9assert_equals(promise.constructor, Promise);10promise.then(function(result) {11  assert_equals(result.value, 'value');12  assert_equals(result.done, false);13});14var rs = new ReadableStream();15var reader = rs.getReader();16reader.releaseLock();17assert_equals(reader.read(), undefined);18assert_equals(reader.closed, undefined);19assert_equals(reader.read(), undefined);20var rs = new ReadableStream();21var reader = rs.getReader();22var promise = reader.cancel('reason');23assert_equals(promise.constructor, Promise);24promise.then(function(result) {25  assert_equals(result, undefined);26});27var rs = new ReadableStream({28  start: function(c) {29    c.close();30  }31});32var reader = rs.getReader();33var promise = reader.read();34assert_equals(promise.constructor, Promise);35promise.then(function(result) {36  assert_equals(result.value, undefined);37  assert_equals(result.done, true);38});39var rs = new ReadableStream({40  start: function(c) {41    c.enqueue('a');42    c.enqueue('b');43    c.enqueue('c');44  }45});46var reader = rs.getReader();47var promise = reader.read();48assert_equals(promise.constructor, Promise);49promise.then(function(result) {50  assert_equals(result.value, 'a');51  assert_equals(result.done, false);52  return reader.read();53}).then(function(result) {

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